You can see Lake Ontario and Tibbett's Point lighthouse in Cape Vincent and/or take the car ferry across to Kingston, Ontario (the biggest city in the region). Or, continue up route 12E to Clayton, grab a bite (there are a few nice lunch spots in particular, just check Tripadvisor) and tour the antique boat museum - that's a "must do" thing if you like boats. Then, keep heading northeast on route 12 to Alexandria Bay to see the sights of the Thousand Islands, take a boat tour, and grab a hotel and a bite. Alexandria Bay has more of a "touristy" feel, but it is more scenic if you can get out on the water than anywhere else on the US side. If you're doing things on the cheap, grab a cheesesteak at Dan's or pizza at Josie's and walk up the hill to the village pavilion and just look at the scenery.
Of the waterfront hotels in Alex Bay, Edgewood has the nicest grounds, Riveredge has the nicest view, and Bonnie Castle has less expensive rooms, some of which have been updated (and others, not so much). Staying off the waterfront in Alex Bay or Clayton is cheaper. Because memorial day weekend is busy in the Thousand Islands, you'll not want to wait until the last minute to reserve a room.
Each of the three US towns is just 25-35 minutes away from where you'll be in Watertown.
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